math
posted by gary .
A. Brad is 12 years older than Sam . If Brad were 8 years older than he is now. he would be twice as old as Sam. How old is Sam now?
B. Barrie is now 2 years older than Krista. In 15 years Barrie's age will be 2 years more than twice Krista's age now. How old will Barrie be in 6 years?
C. John is now 10 years older than Marcus. Three times John's age 5 years from now will be the same as five times Marcus's age 5 years ago. How old is John now?
D. In 1 year Kristen will be four times as old as Danielle. Ten years from then Kristen will only be twice as old as Danielle. How old is Kristen now?

math 
Jack
A. 12+x+8=2x
20+x=2x
(subtract "x" from both sides)
x=20
B. x+2+15=2+2x
(subtract "2" from both sides)
x+15=2x
(subtract "x" from both sides)
x=15 (Krista's age)
15+2=17 (Barrie's age now)
17+6=23 
Math 
Sally
Phil is three times as old as Carrie. Five years ago, phil was four times as old as Carrie was at that time. How old is Carrie now?
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